target-arm: Pass fp status pointer explicitly to neon fp helpers
Make the Neon helpers for various floating point operations take an
explicit pointer to the float_status they use, so they don't rely on
the global environment pointer any more. This also allows us to drop
the mul/sub/add helpers completely and just use the vfp versions.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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